Review Text Format Spec

[thejustinwalsh]

The original implementation of the grammar in this repo predates any known specification and in 2022 a Protocol Buffer Text Format Spec was published.

Review the specification and the grammar to ensure proper handling of all syntax highlighting cases.

[thejustinwalsh]

Additionally while searching for example textproto files, I ran accross this repo, that contains an example grammer https://github.com/PorterAtGoogle/tree-sitter-textproto

[thejustinwalsh]

Note: Comments can appear between syntax tokens:

value: -
  # comment
  2.0         # Valid: whitespace and comments between '-' and '2.0'.

https://protobuf.dev/reference/protobuf/textformat-spec/#parsing